I have a microwave unit separate from my oven unit. After I replaced the microwave plate with a dinner plate (because it broke) the following happened after a few weeks: The micro wave suddenly did not heat anything, although the dials/buttons work and these buttons on a panel also direct the temperature, etc. of the oven below, which works fine. What could have caused the sudden loss of the micro waves ability to heat? By the way, these are "built ins which came with our home about 5 years ago. You help is appreciated

- bad door switches or door switch mounts- loose connection at the magnetron- problem or loose connection on the control unit circuit board- bad magnetron or other high voltage part (such as a shorted diode)

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

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You can get to buy the plates separately , in fact you can many of them if you can get support from any repair/service shops as many microwaves are scrapped if there is a high estimate.
Make sure you take the center slot of the plate to confirm the fittings.

Are you talking about the black round pan? I don't think I have any other parts in my Advantium for speed cooking or convection. I occasionally just use an oven safe dinner plate. Sorry I can't help with replacement parts.